Casey Simpson: Casey Simpson. Actor: Nicky, Ricky, Dicky & Dawn. Casey Simpson is known for his role as as Ricky Harper on the hit Nickelodeon series Nicky, Ricky, Dicky & Dawn. He later went on to star in the film Escape from Mr. Lemoncello's Library in 2017. He was nominated for a Kids Choice Award in 2016 and 2017. Casey was three years old when he began his acting career, landing his...